Carbohydrate are your body's main source of energy. However, it's important to choose the right kind of carbs : whole grains, fruits, vegetables and beans are packed with healthful vitamins and minerals. They also contain fiber, which helps move food wasted material through and out of your body. According to Harvard School of Public Health, refined sources of carbohydrates, such as white bread, white rice, pastries, sugared sodas and other highly processed foods, contribute to weight gain and increase the risk for diabetes and heart disease